35) How many diagonals are there in a closed figure having 19 sides?
a) 282
b) 128
C) 152
d) 192
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1
Answer:
152
Step-by-step explanation:
No. Of Diagonals= n(n-1)/2 - n
=19(19-1)/2 - 19
= 19×18/2 - 19
= 171-19
= 152
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